Sources: 49ers tight end George Kittle's groin injury 'not good'
49ers' George Kittle (groin) gets in limited practice Thursday
49ers' George Kittle idled by groin injury, start vs. Steelers at risk
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49ers' George Kittle idled by groin injury, start vs. Steelers at risk
49ers star tight end George Kittle has groin injury, status for Sunday's opener in doubt - The Boston Globe
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San Francisco 49ers' George Kittle misses practice because of groin injury - ESPN